package com.gxc.web;

import com.gxc.pojo.Book;
import com.gxc.pojo.Page;
import com.gxc.service.BookService;
import com.gxc.service.impl.BookServiceImpl;
import com.gxc.utils.WebUtils;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

/**
 * @Classname BookServlet
 * @Description TODO
 * @Date 2020/11/17 15:59
 * @author by 97830
 */
public class BookServlet extends BaseServlet{
    BookService bookService = new BookServiceImpl();

    protected void page(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取请求的参数 pageNo 和 pageSize
        int pageNo = WebUtils.parseInt(req.getParameter("pageNo"), 1);
        int pageSize = WebUtils.parseInt(req.getParameter("pageSize"), Page.PAGE_SIZE);
        //2.获取请求的参数 pageNo 和 pageSize
        Page<Book> page = bookService.page(pageNo, pageSize);
        page.setUrl("manager/bookServlet?action=page");
        //3.保存 Page 对象到 Request 域中
        req.setAttribute("page", page);
        //4.请求转发到 pages/manager/book_manager.jsp 页面
        req.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(req,resp);
    }

    protected void add(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        int pageNo = WebUtils.parseInt(req.getParameter("pageNo"), 0);
        pageNo +=1 ;
        //1.获取请求的参数封装成为Book对象
        Book book = WebUtils.copyParamToBean(req.getParameterMap(), new Book());
        //2.嗲用用Book Service.addBook（）保存对象
        bookService.addBook(book);
        //3.跳转到图书列表页面
        resp.sendRedirect(req.getContextPath() + "/manager/bookServlet?action=page&pageNo=" + pageNo);
    }

    protected void delete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取请求的参数id，图书编号
        int id = WebUtils.parseInt(req.getParameter("id"), 0);
        //2.调用bookService.deleteBookById()删除图书
        bookService.deleteBookById(id);
        //3.重定向回图书列表
        resp.sendRedirect(req.getContextPath() + "/manager/bookServlet?action=page&pageNo=" + req.getParameter("pageNo"));
    }

    protected void update(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取请求的参数，封装成为Book对象
        Book book = WebUtils.copyParamToBean(req.getParameterMap(), new Book());
        //2.调用 BookService.updateBook( book );修改图书
        bookService.updateBook(book);
        //3。重定向回图书列表管理页面
        resp.sendRedirect(req.getContextPath() + "/manager/bookServlet?action=page&pageNo=" + req.getParameter("pageNo"));
    }

    protected void getBook(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取请求的参数图书编号
        int id = WebUtils.parseInt(req.getParameter("id"), 0);
        //2.调用bookService.queryBookId查询图书
        Book book = bookService.queryBookById(id);
        //3.保存图书到Request域中
        req.setAttribute("book", book);
        //4 请求转发到。pages/manager/book_edit.jsp 页面
        req.getRequestDispatcher("/pages/manager/book_edit.jsp").forward(req,resp);
    }

    protected void list(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.通过BookService查询全部图书
        List<Book> books = bookService.queryBooks();
        //2.把全部图书保存到Request域中
        req.setAttribute("books", books);
        //3.请求转发到/pages/manager/book_manager.jsp
        req.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(req, resp);
    }
}